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Red River

Featured on October 9, 2013

The iron- and sulfur-rich waters of Rio Tinto, a river in Spain, serve as a laboratory for studying possible life-bearing environments on Mars. Although the river's water is turned red by the high concentration of dissolved minerals, it still contains abundant microscopic life. Scientists study this and other Mars-like environments on Earth to learn more about the Red Planet and to develop the tools for looking for life on Mars. [NASA/JPL]

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